Using the Wooldridge (2005) study, download the data set posted on the Journal of Applied Econometrics web site and

(a) Replicate the results given in Table I in that article using (xtprobit, re) in Stata.

(b) Replicate the average partial effects for union membership for married and non-married men for 1986 and 1987 . Verify that the estimates of state dependence in union membership are 0.182 for married men and 0.173 for nonmarried men, respectively.